I’ll help you take care of the error you’ve encountered with your transactions, @jamesmcgowan.
In the meantime, I recommend signing in to your bank’s website to check for notifications that needs your attention. You can also reach out to their Technical Support to see if they’re performing some maintenance.
Unexpected errors while working with your bank transactions in the system can be caused by corrupted files on your browser. To isolate this matter, let's access your QuickBooks Online account using a private window. This mode prevents the system from using stored internet history, passwords, or cookies.
Here are the shortcut keys for each browser:
Press Ctrl + Shift + N for Google Chrome
Hit Ctrl + Shift + P for Internet Explorer or Mozilla Firefox